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Suppression of a SARS-CoV-2 outbreak in the Italian municipality of Vo’
Open accessAbstract
On 21 February 2020, a resident of the municipality of Vo’, a small town near Padua (Italy), died of pneumonia due to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection1. This was the first coronavirus disease 19 (COVID-19)-related death detected in Italy since the detection of SARS-CoV-2 in the Chinese city of Wuhan, Hubei province2. In response, the regional authorities imposed the lockdown of the whole municipality for 14 days3. Here we collected information on the demography, clinical presentation, hospitalization, contact network and the presence of SARS-CoV-2 infection in nasopharyngeal swabs for 85.9% and 71.5% of the population of Vo’ at two consecutive time points. From the first survey, which was conducted around the time the town lockdown started, we found a prevalence of infection of 2.6% (95% confidence interval (CI): 2.1–3.3%). From the second survey, which was conducted at the end of the lockdown, we found a prevalence of 1.2% (95% CI: 0.8–1.8%). Notably, 42.5% (95% CI: 31.5–54.6%) of the confirmed SARS-CoV-2 infections detected across the two surveys were asymptomatic (that is, did not have symptoms at the time of swab testing and did not develop symptoms afterwards). The mean serial interval was 7.2 days (95% CI: 5.9–9.6). We found no statistically significant difference in the viral load of symptomatic versus asymptomatic infections (P = 0.62 and 0.74 for E and RdRp genes, respectively, exact Wilcoxon–Mann–Whitney test). This study sheds light on the frequency of asymptomatic SARS-CoV-2 infection, their infectivity (as measured by the viral load) and provides insights into its transmission dynamics and the efficacy of the implemented control measures. The authors describe the prevalence of SARS-CoV-2 infection, viral load and the frequency of symptomatic versus asymptomatic and presymptomatic infection in an Italian town, before and after a strict 14-day lockdown.
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Early transmission dynamics in Wuhan, China, of novel coronavirus-infected pneumonia
Li, Q., Guan, X., Wu, P., Wang, X., Zhou, L., Tong, Y., Ren, R., Leung, K. S. M., Lau, E. H. Y., Wong, J. Y., et al. (2020) · New England Journal of Medicine · doi:10.1056/nejmoa2001316 · Cited by 16,575
Spread of SARS-CoV-2 in the Icelandic population
Gudbjartsson, D. F., Helgason, A., Jonsson, H., Magnusson, O. T., Melsted, P., Norddahl, G. L., Saemundsdottir, J., Sigurdsson, A., Sulem, P., Agustsdottir, A. B., et al. (2020) · New England Journal of Medicine · doi:10.1056/nejmoa2006100 · Cited by 1,248
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REGN-COV2, a Neutralizing Antibody Cocktail, in Outpatients with Covid-19
Weinreich, D. M., Sivapalasingam, S., Norton, T., Ali, S., Gao, H., Bhore, R., Musser, B. J., Soo, Y., Rofail, D., Im, J., et al. (2021) · New England Journal of Medicine · doi:10.1056/nejmoa2035002 · Cited by 1,642
Kucharski, A. J., Klepac, P., Conlan, A. J. K., Kissler, S. M., Tang, M. L., Fry, H., Gog, J. R., Edmunds, W. J., Emery, J. C., Medley, G., et al. (2020) · The Lancet Infectious Diseases · doi:10.1016/s1473-3099(20)30457-6 · Cited by 900
Levin, A. T., Hanage, W. P., Owusu-Boaitey, N., Cochran, K. B., Walsh, S. P., & Meyerowitz-Katz, G. (2020) · European Journal of Epidemiology · doi:10.1007/s10654-020-00698-1 · Cited by 844
(2020) · doi:10.3138/jammi-2020-0030 · Cited by 664
Evolution and epidemic spread of SARS-CoV-2 in Brazil
Candido, D. S., Claro, I. M., de Jesus, J. G., Souza, W. M., Moreira, F. R. R., Dellicour, S., Mellan, T. A., du Plessis, L., Pereira, R. H. M., Sales, F. C. S., et al. (2020) · Science · doi:10.1126/science.abd2161 · Cited by 573
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Metadata
- Authors
- Lavezzo, E., Franchin, E., Ciavarella, C., Cuomo-Dannenburg, G., Barzon, L., Del Vecchio, C., Rossi, L., Manganelli, R., Loregian, A., Navarin, N., Abate, D., Sciro, M., Merigliano, S., De Canale, E., Vanuzzo, M. C., Besutti, V., Saluzzo, F., Onelia, F., Pacenti, M., Parisi, S. G., Carretta, G., Donato, D., Flor, L., Cocchio, S., Masi, G., Sperduti, A., Cattarino, L., Salvador, R., Nicoletti, M., Caldart, F., Castelli, G., Nieddu, E., Labella, B., Fava, L., Drigo, M., Gaythorpe, K. A. M., Imperial College COVID-19 Response Team, Brazzale, A. R., Toppo, S., Trevisan, M., Baldo, V., Donnelly, C. A., Ferguson, N. M., Dorigatti, I., Crisanti, A., Imperial College COVID-19 Response Team, Ainslie, K. E. C., Baguelin, M., Bhatt, S., Boonyasiri, A., Boyd, O., Cattarino, L., Ciavarella, C., Coupland, H. L., Cucunubá, Z., Cuomo-Dannenburg, G., Djafaara, B. A., Donnelly, C. A., Dorigatti, I., van Elsland, S. L., FitzJohn, R., Flaxman, S., Gaythorpe, K. A. M., Green, W. D., Hallett, T., Hamlet, A., Haw, D., Imai, N., Jeffrey, B., Knock, E., Laydon, D. J., Mellan, T., Mishra, S., Nedjati-Gilani, G., Nouvellet, P., Okell, L. C., Parag, K. V., Riley, S., Thompson, H. A., Unwin, H. J. T., Verity, R., Vollmer, M. A. C., Walker, P. G. T., Walters, C. E., Wang, H., Wang, Y., Watson, O. J., Whittaker, C., Whittles, L. K., Xi, X., & Ferguson, N. M.
- Venue
- Nature
- Published
- 2020-06-30
- Volume
- 584
- Issue
- 7821
- Pages
- 425-429
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W3038505425
- Cited by
- 1,087
- References
- 2
- FWCI
- 40.16
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Lavezzo, E., Franchin, E., Ciavarella, C., Cuomo-Dannenburg, G., Barzon, L., Del Vecchio, C., Rossi, L., Manganelli, R., Loregian, A., Navarin, N., Abate, D., Sciro, M., Merigliano, S., De Canale, E., Vanuzzo, M. C., Besutti, V., Saluzzo, F., Onelia, F., Pacenti, M., . . . Ferguson, N. M. (2020). Suppression of a SARS-CoV-2 outbreak in the Italian municipality of Vo’. Nature. https://doi.org/10.1038/s41586-020-2488-1
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